Of philadelphia



(No Model.)

1). RO'MAINE EXPANSION COVER FOR BgLTs.

No. 272,328. Patented Feb. 13,1883.

v UNITED STATES PATENT OFFICE.

DAVID ROMAINE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR OF ONE- HALF TO N. HARPER STEWARD, OF SAME PLACE.

EXPANSION-COVER FOR BOLTS.

SPECIFICATION formingpart of Letters Patent No. 272,328, dated February 13, 18 63.

' Application filed August 15, 1882. (No model.) I

To all whom it may concern:

Be it known that I, DAVID ROMAINE, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful lm provements in Expansion-Covers for Bolts; and I do hereby declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled to in the art to which it appertains to make and use the same, reference being had to the accom panyin g d rawings, and to. letters or figures of reference marked thereon, which form apart of this specification.

Figure 1 is a side view of the device embodying my invention, with a portion of the outer covering removed. Fig.2 is a vertical section in the line we of Fig. 1. Fig.3 is a cross-section of the bolt and its expansion-cover. Fig. 4 is a face view of the bolt, showing a form of collar. shaped nut.

Similar letters refer to similar parts throughout the several views.

The object of my invention is the construction of an outer covering for bolts, which will so hold the nut in a cavity of equal diameter that while the bolt is being forced home the inner walls of the cavity will receive the strain.

Referring to thedrawings, A represents the stock of a bolt of an ordinary shape, with any desired form of head. Surrounding circumferen'tially this, and preferably divided into three parts, is the expanding cover'B.

At one end of the bolt A, and of a size corresponding to the outer diameter of the expanding cover B, is a conical-shaped nut, 0. One end of the expanding cover B is constructed to fit the taper or conical shape of the not 0, and is provided in the center of each division of the expanding cover B with a small teat-like projection, b, which fits in a corresponding indentation at opposite channets, 0, in the conical not C, as shown in Figs. 2 and 4.

The operation: of my invention will be readily understood. A hole being prepared in iron, wood, stone, or other material, of a di- To not allow the separation of the expand Fig. 5 is an end view of the cone ameter equal to that of the largest diameter of the cone-shaped nut O, the same is placed at thebottom of the same. After this is accomplished the four divisions of the expanding coverB are then introduced,and following this the bolt A itself.

ing cover B, nut O, and bolt A during transportation, and, furthermore, insure a proper arrangement of parts within the cavity in introducingthe bolt A, 1 construct a thin tube of paper, D, or other suitable material, having one of its ends closed, with which I surround each combination of posts. This so holds the cone-shaped nut G, and it in turn, by its mechanical construction, holds the expanding cover B, that the nut O is at once in position to receive the thread of the bolt A.

As soon as the spare bolt is once taken up all the parts are so arranged in position that the not 0 begins its movement toward the head of the bolt A. This causes, through the action of the cone-shaped nut 0, each section of the cover B to expand, which, byso doing, causes the same to bind upon the inner walls of the cavity.

The trail nature of the outer cover, D, where the cavity is quite large, requires little force to burst the same.

I can use my invention for several pur-, poses, such as the elevation of stone or other material in large and heavy bodies, now raised by what is known as a lewis, in which case the head of the bolt would form a hold for the lifting mechanism. As it is, the invention is especially adapted to securing balcomics and all manner of frame-work to plain sur- 8 faces without running the bolt entirely through to the inside and securing it by a collar, thus making a much neater finish, saving of material and time, and yet equally strong and effective. t v

I am aware that bolts have been provided with both single and double wedge-shaped nuts and sectional expausible side covers. I therefore do not claim such, broadly; but

What 1 do. claim, and desire to secure by 5 Letters Patent, is-- t 7 1. The combination of the expansion cover with channels 0, adapted to receive the teats B, provided with teats b, cone-shaped nut O, I), as specified, in combination with the bolt having channels 0, the bolt; A, and shell D, A, substantially as set forth.

said shell being adapted to receive the bolt, in DAVID ROMAINE. 5 the manner and for the purposes specified. Witnesses:

2. The sectional expansion-cover B,pruvi(le(l R. S. REED, with teats b, the cone-shaped nut 0, provided LEWIS F. BROUS. 

